tests: enhance AT_SYNCLINES_COMPILE.

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index 3ba48db5ea55034fb67541caa77dc8f0adb2b837..e7308be301bc9764683cca526c4ecdcef2253d88 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -1,8 +1,7 @@
                                                             -*- Autoconf -*-
 
 # C M4 Macros for Bison.
-# Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009
-# Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004-2010 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -161,7 +160,8 @@ m4_define([b4_int_type_for],
 # --------------------------------------------
 # Without inducing a comparison warning from the compiler, check if the
 # literal value LITERAL equals VALUE from table TABLE, which must have
-# TABLE_min and TABLE_max defined.
+# TABLE_min and TABLE_max defined.  YYID must be defined as an identity
+# function that suppresses warnings about constant conditions.
 m4_define([b4_table_value_equals],
 [m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
                || m4_indir([b4_]$1[_max]) < $3), [1],